Core-guide for sand molds



(No Model.)

C. HERMAN.

GORE GUIDE FOR SAND Moms.

'finire Srarns firmen@ ,armar CORE-GUIDE FOR SAND IVIOLDS.

SPECIFICATION forming part of Letters Patent No. 363,138, elated May 17| 1887.

Application filed March 18, 1887.

To all whom, it may concern:

Be it known that l, CHARLES HERMAN, of Allegheny City, in the county ofAllegheny and State of Pennsylvania, have invented a new and usefulImprovement in Core-Guides for Sand Molds; and I do hereby declare thefollowing to be a full, clear, and exact description thereof.

Myinvention relates to the making and placing of cores in sand molds,its object being to provide simple means for inserting green-sand coresin molds-that is, inserting the cores in the molds without previouslydrying or baking, as is generally the custom with the sand cores.

In the manufacture of iron and other castings many different molds areformed which require cores therein, the cores being of different shapes,and it is generally foundnccessary to form them hard and sufficientlysolid to handle easily; and to this end these cores have beennecessarily baked before they were placed within the greensand molds.

Heretofore in two-part molds (that is, the molds in which one part ofthe mold-cavity is formed in the sand supported within one flask and theother part is formedy in the sand supported within another flask landthe core placed in the mold-cavity in one mold and the other mold thenplaced thereon) means have been provided for placing `greensand cores,or cores which have just been molded and which are not baked ordried,within the molds. The most approved of such devices consisted of acore-box forming part of a plate, which plate had suitable guide-pinsthereon which corresponded to the guidingsockets on the flask in whichone part of the mold is formed. The core-box was made partiblelongitudinally, and one part formed with the plate and the other part'formed removable therefrom, and the core was necessarily rammedhorizontally as the plate rested on a suitable table or support, theupper part of the corebox being then removed, leaving the core restingin the other part of the core-box and the core extending above theplate. The half-mold previously formed was then guided down onto thecore by means of the guide-pins on the plate of the core-box, the askand coreboX plate then turned over, so that the core rested within themoldeavity, and the plate Serial No. 231,398. (NomodeLl having thecore-box formed therewith wit-hdrawn, leaving the core within themold-cavity, so that the other half of the mold could be placed thereon,forming the finished mold.A

This apparatus has certain objections, the pri ncipal being that` thecore was necessarily rammed horizontally and that it was necessary todrop or lower the flask containing the half-mold onto the core, which insome cases caused the destruction of or injury to the m old, as the sandtherein was not supported, except by the walls of' the flask, when themold was lowered onto the core and was liable to drop out of the flask.The apparatus was also heavy and unwieldy, and required the inverting ofthe flask to place the core therein.

The object of my invention is to provide a simpler means for introducingthe core into the Ahalf-mold; and it consists, essentially, in formingon the flask certain hinge portions and combining therewith a core-boxhaving arms provided with hinge portions engaging with those on theflask, by means of which the coreboX, after the formation of' the core,can be secured to the flask and the core accurately guided into andplaced within the mold-cavity of the half-mold.

It also consists in certain details of construe tion, as hereinafter setforth.

To enable othersy skilled in the art to make and use my invention, Iwill describe the same more fully, referring to the accompanyingdrawings, in which- Figure l is a perspective view of my improvedcore-box. Fig. 2 is a like view showing the core-box secured to theflask. Fig. 3 is a sectional view showing the manner of' introducing thecore into the flask. lFigs. 4 and 5 represent the manner of withdrawingthe core-box, and Fig. Gshews the core within. the finished mold.

Like letters of reference indicate like parts in each.

The flask a is of any ordinary construction, having thereon suitabledowel-pins and sockets, b, to guide the two parts of the flask togetherand hold the flask and pattern. in proper line during the formationofthe moldo On one side of' the flask are formed the hinge portions e,which are of any construction suitable for engaging with thehingeportions d ou the arms e of the cerebex f, thehinge portions I on theICQ arms being what are termed open hinges, so that they can beconnected to the hinge portions c by passing transversely onto thepintles c thereof', the two lips d of each hinge portion d fitting theone on one side and the other on the other side of the pintle c of thehinge. By means of these hinge portions the core-box is brought inproper relative position to the flask so as to guide the core into themold-cavity g formed within the sand ofthe ask. The coreboX j' ispartible longitudinally, one half, f', thereof being connected by anysuitable means to the other half, f2, thereof, and the half-box f2 beingsecured to the arms e. This core-box can bc removed from the flask andthe core rammed or formed therein while the core-box is in a verticalposition. The hinge portions on the flask and the guidearms, with theirhinge portions, are placed in proper position and made of proper lengthto guide thc core accurately into the mold-cavity, so that when theparts are raised to enter the core into the 1noldcavity these arms andhinges act to direct it accurately into its seat. After the formation ofthe core the hinge portions d are caused to engage with the hingeportion c on the flask, and the upper half, f,'of the core-box is thenremoved, leaving the upper half of the core exposed, thevcore resting inthe lower half, j", of the core-box, as shown in Fig. 2. In order, now,to insert the core within the mold-cavity g, as the core would naturallydrop out of the core-box if it were turned over above the flask, and asit is not desirable to turn the flask over upon the core-box, since themold might bc injured thereby, the flask and the core-box are raisedtogether, the flask being canted on one side edge thereof and the coredirected bythe hinge-connections and the arms, so as to guide the coreproperly into the moldcavity g. After which, as soon. as the core isguided into place, the flask may be lowered, the core-box resting uponthe core while it rests within the mold-cavity.

` In case the core formed is cylindrical, the

core-box may then be removed by simply drawing it back on itshingeconnections, as it will then clear itself of the core; but wherethe core formed is angular this could not of course be done; and inorder to remove the core-box it must be lifted vertically from the mold,its vertical'movement being directed by the lips d of the hingedportions d, which hold it in proper relative position to thel core andmold until it is removed therefrom. These hinge portions and theirconnections with thev core-box thus act to guide the core into themold-cavity, as well as to guide the operator in removing the core-box,whether itis drawn off by a swinging movement, with the hingeconnectionas a center, or lifted vertically therefrom.

rllhe device is simple in construction and can be applied at a small`expense to lany molds, and by its use these green-sand cores can beformed more rapidly, as they can be molded when in a vertical position,and the cores can be in serted with greater facility than with thedevices heretofore in use.

ThatI claim as my invent-ion, and desire to secure by Letters Patent, is

1. In sand molding apparatus, the combination, with the fiask, of acore-box provided with guide-arms and suitable hinge-connections betweensaid guide arms and fiask, whereby the core formed can be directed intothe seatof the mold-cavity, substantially as and for the purposes setforth.

2. ln sand'molding apparatus, the combination, with the flask having thehinge portions thereon, of the core-box provided with guidearms havingopen hinge portions,substantially as and for the purposes set forth.

` ln testimony whereof l', the said CHARLES HERMAN, have hereunto set myhand.

GHAS. HERMAN.

Witnesses:

N. S. STooKWnLL,. J. NEGLEY COOKE.

